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  1. P

    Sound Level Indicator

    I used the 33172 op amp so that shouldn't be the problem, however my signal to the 3915 is always high. Even if I take the mic out of the circuit the signal is like 5V or so which if my understanding is correct be at most 0.5V? Pin 6 is also high and the led's are always on. Do you have any idea...
  2. P

    Sound Level Indicator

    Hi Audioguru, I am new to this site and I am in the middle of building this project but I can not seem to get it working properly. I know I have a serious problem as the the dc voltage of pin 5 of the 3915 is 5.2V and pin 6 is 1.25V. In dot mode the tenth set of led's is on and in bar mode...
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